Hi,

Some people have tried boring out the carb with a drill, but the carb barrel is bade fom really hard steel, and unless you have good drill bits, you will find it quite hard. Also you can try getting rid of the low speed needle out of the carb if you dont want an idle to allow more air through the carb.

Try increasing the nitro percentage in your fuel. Also switch to a slightly colder plug or increase the number of head shims when you add more nitro as to avoid detonation.

There are ways to alter the exaust and boost port timings, but I dont have the knoweldge here to help you. You risk stuffing your engine up, and really need to know what you are doing.

Stefan